| dc.creator | Ewall-Wice, A. | |
| dc.creator | Chang, T.-C. | |
| dc.creator | Lazio, J. | |
| dc.creator | Doré, O. | |
| dc.creator | Seiffert, M. | |
| dc.creator | Monsalve, Raúl | |
| dc.date | 2020-06-15T21:38:32Z | |
| dc.date | 2020-06-15T21:38:32Z | |
| dc.date | 2018-11-20 | |
| dc.date.accessioned | 2022-10-18T12:07:19Z | |
| dc.date.available | 2022-10-18T12:07:19Z | |
| dc.identifier | The Astrophysical Journal, Volume 868, Number 1:63 | |
| dc.identifier | 0004-637X | |
| dc.identifier | http://repositoriodigital.ucsc.cl/handle/25022009/1871 | |
| dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/4441505 | |
| dc.description | Artículo de publicación ISI | |
| dc.description | We estimate the 21 cm radio background from accretion onto the first intermediate-mass black holes between z ≈ 30 and z ≈ 16. Combining potentially optimistic, but plausible, scenarios for black hole formation and growth with empirical correlations between luminosity and radio emission observed in low-redshift active galactic nuclei, we find that a model of black holes forming in molecular cooling halos is able to produce a 21 cm background that exceeds the cosmic microwave background (CMB) at z ≈ 17, though models involving larger halo masses are not entirely excluded. Such a background could explain the surprisingly large amplitude of the 21 cm absorption feature recently reported by the EDGES collaboration. Such black holes would also produce significant X-ray emission and contribute to the 0.5–2 keV soft X-ray background at the level of ≈10−13–10−12 erg s−1 cm−2 deg−2, consistent with existing constraints. In order to avoid heating the intergalactic medium (IGM) over the EDGES trough, these black holes would need to be obscured by hydrogen column depths of N H ~ 5 × 1023 cm−2. Such black holes would avoid violating constraints on the CMB optical depth from Planck if their UV photon escape fractions were below f esc 0.1, which would be a natural result of N H ~ 5 × 1023 cm−2 being imposed by an unheated IGM. | |
| dc.language | en | |
| dc.publisher | The American Astronomical Society (AAS) | |
| dc.source | https://doi.org/10.3847/1538-4357/aae51d | |
| dc.subject | Dark ages | |
| dc.subject | Reionization | |
| dc.subject | First stars | |
| dc.title | Modeling the radio background from the first black holes at cosmic dawn: implications for the 21 cm absorption amplitude | |
| dc.type | Artículos de revistas | |
